4 * Copyright (C) 1992 Rick Sladkey
6 * Changes Copyright (C) 1994 by Florian La Roche
7 * - Do not copy data too often around in the kernel.
8 * - In nfs_file_read the return value of kmalloc wasn't checked.
9 * - Put in a better version of read look-ahead buffering. Original idea
10 * and implementation by Wai S Kok elekokws@ee.nus.sg.
12 * Expire cache on write to a file by Wai S Kok (Oct 1994).
14 * Total rewrite of read side for new NFS buffer cache.. Linus.
16 * nfs regular file handling functions
19 #include <linux/time.h>
20 #include <linux/kernel.h>
21 #include <linux/errno.h>
22 #include <linux/fcntl.h>
23 #include <linux/stat.h>
24 #include <linux/nfs_fs.h>
25 #include <linux/nfs_mount.h>
27 #include <linux/pagemap.h>
28 #include <linux/aio.h>
29 #include <linux/gfp.h>
30 #include <linux/swap.h>
32 #include <asm/uaccess.h>
34 #include "delegation.h"
40 #define NFSDBG_FACILITY NFSDBG_FILE
42 static const struct vm_operations_struct nfs_file_vm_ops;
44 const struct inode_operations nfs_file_inode_operations = {
45 .permission = nfs_permission,
46 .getattr = nfs_getattr,
47 .setattr = nfs_setattr,
51 const struct inode_operations nfs3_file_inode_operations = {
52 .permission = nfs_permission,
53 .getattr = nfs_getattr,
54 .setattr = nfs_setattr,
55 .listxattr = nfs3_listxattr,
56 .getxattr = nfs3_getxattr,
57 .setxattr = nfs3_setxattr,
58 .removexattr = nfs3_removexattr,
60 #endif /* CONFIG_NFS_v3 */
62 /* Hack for future NFS swap support */
64 # define IS_SWAPFILE(inode) (0)
67 static int nfs_check_flags(int flags)
69 if ((flags & (O_APPEND | O_DIRECT)) == (O_APPEND | O_DIRECT))
79 nfs_file_open(struct inode *inode, struct file *filp)
83 dprintk("NFS: open file(%s/%s)\n",
84 filp->f_path.dentry->d_parent->d_name.name,
85 filp->f_path.dentry->d_name.name);
87 nfs_inc_stats(inode, NFSIOS_VFSOPEN);
88 res = nfs_check_flags(filp->f_flags);
92 res = nfs_open(inode, filp);
97 nfs_file_release(struct inode *inode, struct file *filp)
99 dprintk("NFS: release(%s/%s)\n",
100 filp->f_path.dentry->d_parent->d_name.name,
101 filp->f_path.dentry->d_name.name);
103 nfs_inc_stats(inode, NFSIOS_VFSRELEASE);
104 return nfs_release(inode, filp);
108 * nfs_revalidate_size - Revalidate the file size
109 * @inode - pointer to inode struct
110 * @file - pointer to struct file
112 * Revalidates the file length. This is basically a wrapper around
113 * nfs_revalidate_inode() that takes into account the fact that we may
114 * have cached writes (in which case we don't care about the server's
115 * idea of what the file length is), or O_DIRECT (in which case we
116 * shouldn't trust the cache).
118 static int nfs_revalidate_file_size(struct inode *inode, struct file *filp)
120 struct nfs_server *server = NFS_SERVER(inode);
121 struct nfs_inode *nfsi = NFS_I(inode);
123 if (nfs_have_delegated_attributes(inode))
126 if (filp->f_flags & O_DIRECT)
128 if (nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE)
130 if (nfs_attribute_timeout(inode))
135 return __nfs_revalidate_inode(server, inode);
138 static loff_t nfs_file_llseek(struct file *filp, loff_t offset, int origin)
140 dprintk("NFS: llseek file(%s/%s, %lld, %d)\n",
141 filp->f_path.dentry->d_parent->d_name.name,
142 filp->f_path.dentry->d_name.name,
146 * origin == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
147 * the cached file length
149 if (origin != SEEK_SET && origin != SEEK_CUR) {
150 struct inode *inode = filp->f_mapping->host;
152 int retval = nfs_revalidate_file_size(inode, filp);
154 return (loff_t)retval;
157 return generic_file_llseek(filp, offset, origin);
161 * Flush all dirty pages, and check for write errors.
164 nfs_file_flush(struct file *file, fl_owner_t id)
166 struct dentry *dentry = file->f_path.dentry;
167 struct inode *inode = dentry->d_inode;
169 dprintk("NFS: flush(%s/%s)\n",
170 dentry->d_parent->d_name.name,
171 dentry->d_name.name);
173 nfs_inc_stats(inode, NFSIOS_VFSFLUSH);
174 if ((file->f_mode & FMODE_WRITE) == 0)
177 /* Flush writes to the server and return any errors */
178 return vfs_fsync(file, 0);
182 nfs_file_read(struct kiocb *iocb, const struct iovec *iov,
183 unsigned long nr_segs, loff_t pos)
185 struct dentry * dentry = iocb->ki_filp->f_path.dentry;
186 struct inode * inode = dentry->d_inode;
189 if (iocb->ki_filp->f_flags & O_DIRECT)
190 return nfs_file_direct_read(iocb, iov, nr_segs, pos);
192 dprintk("NFS: read(%s/%s, %lu@%lu)\n",
193 dentry->d_parent->d_name.name, dentry->d_name.name,
194 (unsigned long) iov_length(iov, nr_segs), (unsigned long) pos);
196 result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping);
198 result = generic_file_aio_read(iocb, iov, nr_segs, pos);
200 nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, result);
206 nfs_file_splice_read(struct file *filp, loff_t *ppos,
207 struct pipe_inode_info *pipe, size_t count,
210 struct dentry *dentry = filp->f_path.dentry;
211 struct inode *inode = dentry->d_inode;
214 dprintk("NFS: splice_read(%s/%s, %lu@%Lu)\n",
215 dentry->d_parent->d_name.name, dentry->d_name.name,
216 (unsigned long) count, (unsigned long long) *ppos);
218 res = nfs_revalidate_mapping(inode, filp->f_mapping);
220 res = generic_file_splice_read(filp, ppos, pipe, count, flags);
222 nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, res);
228 nfs_file_mmap(struct file * file, struct vm_area_struct * vma)
230 struct dentry *dentry = file->f_path.dentry;
231 struct inode *inode = dentry->d_inode;
234 dprintk("NFS: mmap(%s/%s)\n",
235 dentry->d_parent->d_name.name, dentry->d_name.name);
237 /* Note: generic_file_mmap() returns ENOSYS on nommu systems
238 * so we call that before revalidating the mapping
240 status = generic_file_mmap(file, vma);
242 vma->vm_ops = &nfs_file_vm_ops;
243 status = nfs_revalidate_mapping(inode, file->f_mapping);
249 * Flush any dirty pages for this process, and check for write errors.
250 * The return status from this call provides a reliable indication of
251 * whether any write errors occurred for this process.
253 * Notice that it clears the NFS_CONTEXT_ERROR_WRITE before synching to
254 * disk, but it retrieves and clears ctx->error after synching, despite
255 * the two being set at the same time in nfs_context_set_write_error().
256 * This is because the former is used to notify the _next_ call to
257 * nfs_file_write() that a write error occurred, and hence cause it to
258 * fall back to doing a synchronous write.
261 nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
263 struct dentry *dentry = file->f_path.dentry;
264 struct nfs_open_context *ctx = nfs_file_open_context(file);
265 struct inode *inode = dentry->d_inode;
266 int have_error, status;
269 dprintk("NFS: fsync file(%s/%s) datasync %d\n",
270 dentry->d_parent->d_name.name, dentry->d_name.name,
273 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
274 mutex_lock(&inode->i_mutex);
276 nfs_inc_stats(inode, NFSIOS_VFSFSYNC);
277 have_error = test_and_clear_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
278 status = nfs_commit_inode(inode, FLUSH_SYNC);
279 if (status >= 0 && ret < 0)
281 have_error |= test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
283 ret = xchg(&ctx->error, 0);
284 if (!ret && status < 0)
286 if (!ret && !datasync)
287 /* application has asked for meta-data sync */
288 ret = pnfs_layoutcommit_inode(inode, true);
289 mutex_unlock(&inode->i_mutex);
294 * Decide whether a read/modify/write cycle may be more efficient
295 * then a modify/write/read cycle when writing to a page in the
298 * The modify/write/read cycle may occur if a page is read before
299 * being completely filled by the writer. In this situation, the
300 * page must be completely written to stable storage on the server
301 * before it can be refilled by reading in the page from the server.
302 * This can lead to expensive, small, FILE_SYNC mode writes being
305 * It may be more efficient to read the page first if the file is
306 * open for reading in addition to writing, the page is not marked
307 * as Uptodate, it is not dirty or waiting to be committed,
308 * indicating that it was previously allocated and then modified,
309 * that there were valid bytes of data in that range of the file,
310 * and that the new data won't completely replace the old data in
311 * that range of the file.
313 static int nfs_want_read_modify_write(struct file *file, struct page *page,
314 loff_t pos, unsigned len)
316 unsigned int pglen = nfs_page_length(page);
317 unsigned int offset = pos & (PAGE_CACHE_SIZE - 1);
318 unsigned int end = offset + len;
320 if ((file->f_mode & FMODE_READ) && /* open for read? */
321 !PageUptodate(page) && /* Uptodate? */
322 !PagePrivate(page) && /* i/o request already? */
323 pglen && /* valid bytes of file? */
324 (end < pglen || offset)) /* replace all valid bytes? */
330 * This does the "real" work of the write. We must allocate and lock the
331 * page to be sent back to the generic routine, which then copies the
332 * data from user space.
334 * If the writer ends up delaying the write, the writer needs to
335 * increment the page use counts until he is done with the page.
337 static int nfs_write_begin(struct file *file, struct address_space *mapping,
338 loff_t pos, unsigned len, unsigned flags,
339 struct page **pagep, void **fsdata)
342 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
346 dfprintk(PAGECACHE, "NFS: write_begin(%s/%s(%ld), %u@%lld)\n",
347 file->f_path.dentry->d_parent->d_name.name,
348 file->f_path.dentry->d_name.name,
349 mapping->host->i_ino, len, (long long) pos);
353 * Prevent starvation issues if someone is doing a consistency
356 ret = wait_on_bit(&NFS_I(mapping->host)->flags, NFS_INO_FLUSHING,
357 nfs_wait_bit_killable, TASK_KILLABLE);
361 page = grab_cache_page_write_begin(mapping, index, flags);
366 ret = nfs_flush_incompatible(file, page);
369 page_cache_release(page);
370 } else if (!once_thru &&
371 nfs_want_read_modify_write(file, page, pos, len)) {
373 ret = nfs_readpage(file, page);
374 page_cache_release(page);
381 static int nfs_write_end(struct file *file, struct address_space *mapping,
382 loff_t pos, unsigned len, unsigned copied,
383 struct page *page, void *fsdata)
385 unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
388 dfprintk(PAGECACHE, "NFS: write_end(%s/%s(%ld), %u@%lld)\n",
389 file->f_path.dentry->d_parent->d_name.name,
390 file->f_path.dentry->d_name.name,
391 mapping->host->i_ino, len, (long long) pos);
394 * Zero any uninitialised parts of the page, and then mark the page
395 * as up to date if it turns out that we're extending the file.
397 if (!PageUptodate(page)) {
398 unsigned pglen = nfs_page_length(page);
399 unsigned end = offset + len;
402 zero_user_segments(page, 0, offset,
403 end, PAGE_CACHE_SIZE);
404 SetPageUptodate(page);
405 } else if (end >= pglen) {
406 zero_user_segment(page, end, PAGE_CACHE_SIZE);
408 SetPageUptodate(page);
410 zero_user_segment(page, pglen, PAGE_CACHE_SIZE);
413 status = nfs_updatepage(file, page, offset, copied);
416 page_cache_release(page);
424 * Partially or wholly invalidate a page
425 * - Release the private state associated with a page if undergoing complete
427 * - Called if either PG_private or PG_fscache is set on the page
428 * - Caller holds page lock
430 static void nfs_invalidate_page(struct page *page, unsigned long offset)
432 dfprintk(PAGECACHE, "NFS: invalidate_page(%p, %lu)\n", page, offset);
436 /* Cancel any unstarted writes on this page */
437 nfs_wb_page_cancel(page->mapping->host, page);
439 nfs_fscache_invalidate_page(page, page->mapping->host);
443 * Attempt to release the private state associated with a page
444 * - Called if either PG_private or PG_fscache is set on the page
445 * - Caller holds page lock
446 * - Return true (may release page) or false (may not)
448 static int nfs_release_page(struct page *page, gfp_t gfp)
450 struct address_space *mapping = page->mapping;
452 dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page);
454 /* Only do I/O if gfp is a superset of GFP_KERNEL */
455 if (mapping && (gfp & GFP_KERNEL) == GFP_KERNEL) {
456 int how = FLUSH_SYNC;
458 /* Don't let kswapd deadlock waiting for OOM RPC calls */
459 if (current_is_kswapd())
461 nfs_commit_inode(mapping->host, how);
463 /* If PagePrivate() is set, then the page is not freeable */
464 if (PagePrivate(page))
466 return nfs_fscache_release_page(page, gfp);
470 * Attempt to clear the private state associated with a page when an error
471 * occurs that requires the cached contents of an inode to be written back or
473 * - Called if either PG_private or fscache is set on the page
474 * - Caller holds page lock
475 * - Return 0 if successful, -error otherwise
477 static int nfs_launder_page(struct page *page)
479 struct inode *inode = page->mapping->host;
480 struct nfs_inode *nfsi = NFS_I(inode);
482 dfprintk(PAGECACHE, "NFS: launder_page(%ld, %llu)\n",
483 inode->i_ino, (long long)page_offset(page));
485 nfs_fscache_wait_on_page_write(nfsi, page);
486 return nfs_wb_page(inode, page);
489 const struct address_space_operations nfs_file_aops = {
490 .readpage = nfs_readpage,
491 .readpages = nfs_readpages,
492 .set_page_dirty = __set_page_dirty_nobuffers,
493 .writepage = nfs_writepage,
494 .writepages = nfs_writepages,
495 .write_begin = nfs_write_begin,
496 .write_end = nfs_write_end,
497 .invalidatepage = nfs_invalidate_page,
498 .releasepage = nfs_release_page,
499 .direct_IO = nfs_direct_IO,
500 .migratepage = nfs_migrate_page,
501 .launder_page = nfs_launder_page,
502 .error_remove_page = generic_error_remove_page,
506 * Notification that a PTE pointing to an NFS page is about to be made
507 * writable, implying that someone is about to modify the page through a
508 * shared-writable mapping
510 static int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
512 struct page *page = vmf->page;
513 struct file *filp = vma->vm_file;
514 struct dentry *dentry = filp->f_path.dentry;
516 int ret = VM_FAULT_NOPAGE;
517 struct address_space *mapping;
519 dfprintk(PAGECACHE, "NFS: vm_page_mkwrite(%s/%s(%ld), offset %lld)\n",
520 dentry->d_parent->d_name.name, dentry->d_name.name,
521 filp->f_mapping->host->i_ino,
522 (long long)page_offset(page));
524 /* make sure the cache has finished storing the page */
525 nfs_fscache_wait_on_page_write(NFS_I(dentry->d_inode), page);
528 mapping = page->mapping;
529 if (mapping != dentry->d_inode->i_mapping)
532 wait_on_page_writeback(page);
534 pagelen = nfs_page_length(page);
538 ret = VM_FAULT_LOCKED;
539 if (nfs_flush_incompatible(filp, page) == 0 &&
540 nfs_updatepage(filp, page, 0, pagelen) == 0)
543 ret = VM_FAULT_SIGBUS;
550 static const struct vm_operations_struct nfs_file_vm_ops = {
551 .fault = filemap_fault,
552 .page_mkwrite = nfs_vm_page_mkwrite,
555 static int nfs_need_sync_write(struct file *filp, struct inode *inode)
557 struct nfs_open_context *ctx;
559 if (IS_SYNC(inode) || (filp->f_flags & O_DSYNC))
561 ctx = nfs_file_open_context(filp);
562 if (test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags))
567 static ssize_t nfs_file_write(struct kiocb *iocb, const struct iovec *iov,
568 unsigned long nr_segs, loff_t pos)
570 struct dentry * dentry = iocb->ki_filp->f_path.dentry;
571 struct inode * inode = dentry->d_inode;
572 unsigned long written = 0;
574 size_t count = iov_length(iov, nr_segs);
576 if (iocb->ki_filp->f_flags & O_DIRECT)
577 return nfs_file_direct_write(iocb, iov, nr_segs, pos);
579 dprintk("NFS: write(%s/%s, %lu@%Ld)\n",
580 dentry->d_parent->d_name.name, dentry->d_name.name,
581 (unsigned long) count, (long long) pos);
584 if (IS_SWAPFILE(inode))
587 * O_APPEND implies that we must revalidate the file length.
589 if (iocb->ki_filp->f_flags & O_APPEND) {
590 result = nfs_revalidate_file_size(inode, iocb->ki_filp);
599 result = generic_file_aio_write(iocb, iov, nr_segs, pos);
603 /* Return error values for O_DSYNC and IS_SYNC() */
604 if (result >= 0 && nfs_need_sync_write(iocb->ki_filp, inode)) {
605 int err = vfs_fsync(iocb->ki_filp, 0);
610 nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written);
615 printk(KERN_INFO "NFS: attempt to write to active swap file!\n");
619 static ssize_t nfs_file_splice_write(struct pipe_inode_info *pipe,
620 struct file *filp, loff_t *ppos,
621 size_t count, unsigned int flags)
623 struct dentry *dentry = filp->f_path.dentry;
624 struct inode *inode = dentry->d_inode;
625 unsigned long written = 0;
628 dprintk("NFS splice_write(%s/%s, %lu@%llu)\n",
629 dentry->d_parent->d_name.name, dentry->d_name.name,
630 (unsigned long) count, (unsigned long long) *ppos);
633 * The combination of splice and an O_APPEND destination is disallowed.
636 ret = generic_file_splice_write(pipe, filp, ppos, count, flags);
640 if (ret >= 0 && nfs_need_sync_write(filp, inode)) {
641 int err = vfs_fsync(filp, 0);
646 nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written);
651 do_getlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
653 struct inode *inode = filp->f_mapping->host;
655 unsigned int saved_type = fl->fl_type;
657 /* Try local locking first */
658 posix_test_lock(filp, fl);
659 if (fl->fl_type != F_UNLCK) {
660 /* found a conflict */
663 fl->fl_type = saved_type;
665 if (nfs_have_delegation(inode, FMODE_READ))
671 status = NFS_PROTO(inode)->lock(filp, cmd, fl);
675 fl->fl_type = F_UNLCK;
679 static int do_vfs_lock(struct file *file, struct file_lock *fl)
682 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
684 res = posix_lock_file_wait(file, fl);
687 res = flock_lock_file_wait(file, fl);
696 do_unlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
698 struct inode *inode = filp->f_mapping->host;
702 * Flush all pending writes before doing anything
705 nfs_sync_mapping(filp->f_mapping);
707 /* NOTE: special case
708 * If we're signalled while cleaning up locks on process exit, we
709 * still need to complete the unlock.
712 * Use local locking if mounted with "-onolock" or with appropriate
716 status = NFS_PROTO(inode)->lock(filp, cmd, fl);
718 status = do_vfs_lock(filp, fl);
723 is_time_granular(struct timespec *ts) {
724 return ((ts->tv_sec == 0) && (ts->tv_nsec <= 1000));
728 do_setlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
730 struct inode *inode = filp->f_mapping->host;
734 * Flush all pending writes before doing anything
737 status = nfs_sync_mapping(filp->f_mapping);
742 * Use local locking if mounted with "-onolock" or with appropriate
746 status = NFS_PROTO(inode)->lock(filp, cmd, fl);
748 status = do_vfs_lock(filp, fl);
753 * Revalidate the cache if the server has time stamps granular
754 * enough to detect subsecond changes. Otherwise, clear the
755 * cache to prevent missing any changes.
757 * This makes locking act as a cache coherency point.
759 nfs_sync_mapping(filp->f_mapping);
760 if (!nfs_have_delegation(inode, FMODE_READ)) {
761 if (is_time_granular(&NFS_SERVER(inode)->time_delta))
762 __nfs_revalidate_inode(NFS_SERVER(inode), inode);
764 nfs_zap_caches(inode);
771 * Lock a (portion of) a file
773 static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl)
775 struct inode *inode = filp->f_mapping->host;
779 dprintk("NFS: lock(%s/%s, t=%x, fl=%x, r=%lld:%lld)\n",
780 filp->f_path.dentry->d_parent->d_name.name,
781 filp->f_path.dentry->d_name.name,
782 fl->fl_type, fl->fl_flags,
783 (long long)fl->fl_start, (long long)fl->fl_end);
785 nfs_inc_stats(inode, NFSIOS_VFSLOCK);
787 /* No mandatory locks over NFS */
788 if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
791 if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FCNTL)
794 if (NFS_PROTO(inode)->lock_check_bounds != NULL) {
795 ret = NFS_PROTO(inode)->lock_check_bounds(fl);
801 ret = do_getlk(filp, cmd, fl, is_local);
802 else if (fl->fl_type == F_UNLCK)
803 ret = do_unlk(filp, cmd, fl, is_local);
805 ret = do_setlk(filp, cmd, fl, is_local);
811 * Lock a (portion of) a file
813 static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl)
815 struct inode *inode = filp->f_mapping->host;
818 dprintk("NFS: flock(%s/%s, t=%x, fl=%x)\n",
819 filp->f_path.dentry->d_parent->d_name.name,
820 filp->f_path.dentry->d_name.name,
821 fl->fl_type, fl->fl_flags);
823 if (!(fl->fl_flags & FL_FLOCK))
826 if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FLOCK)
829 /* We're simulating flock() locks using posix locks on the server */
830 fl->fl_owner = (fl_owner_t)filp;
832 fl->fl_end = OFFSET_MAX;
834 if (fl->fl_type == F_UNLCK)
835 return do_unlk(filp, cmd, fl, is_local);
836 return do_setlk(filp, cmd, fl, is_local);
840 * There is no protocol support for leases, so we have no way to implement
841 * them correctly in the face of opens by other clients.
843 static int nfs_setlease(struct file *file, long arg, struct file_lock **fl)
845 dprintk("NFS: setlease(%s/%s, arg=%ld)\n",
846 file->f_path.dentry->d_parent->d_name.name,
847 file->f_path.dentry->d_name.name, arg);
851 const struct file_operations nfs_file_operations = {
852 .llseek = nfs_file_llseek,
853 .read = do_sync_read,
854 .write = do_sync_write,
855 .aio_read = nfs_file_read,
856 .aio_write = nfs_file_write,
857 .mmap = nfs_file_mmap,
858 .open = nfs_file_open,
859 .flush = nfs_file_flush,
860 .release = nfs_file_release,
861 .fsync = nfs_file_fsync,
864 .splice_read = nfs_file_splice_read,
865 .splice_write = nfs_file_splice_write,
866 .check_flags = nfs_check_flags,
867 .setlease = nfs_setlease,
872 nfs4_file_open(struct inode *inode, struct file *filp)
875 * NFSv4 opens are handled in d_lookup and d_revalidate. If we get to
876 * this point, then something is very wrong
878 dprintk("NFS: %s called! inode=%p filp=%p\n", __func__, inode, filp);
882 const struct file_operations nfs4_file_operations = {
883 .llseek = nfs_file_llseek,
884 .read = do_sync_read,
885 .write = do_sync_write,
886 .aio_read = nfs_file_read,
887 .aio_write = nfs_file_write,
888 .mmap = nfs_file_mmap,
889 .open = nfs4_file_open,
890 .flush = nfs_file_flush,
891 .release = nfs_file_release,
892 .fsync = nfs_file_fsync,
895 .splice_read = nfs_file_splice_read,
896 .splice_write = nfs_file_splice_write,
897 .check_flags = nfs_check_flags,
898 .setlease = nfs_setlease,
900 #endif /* CONFIG_NFS_V4 */